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Pluripotential liver stem cells: facultative stem cells located in the biliary tree
M R Alison1, M H Golding, C E Sarraf
1Department of Histopathology, Royal Postgraduate Medical School, London, UK.
Cell Proliferation
|July 1, 1996
Summary
Liver stem cells reside in the biliary epithelium and give rise to oval cells, which generate new hepatocytes when liver regeneration is impaired. This process highlights the liver's conditional stem cell-based regeneration.
Area of Science:
- Hepatology
- Stem Cell Biology
- Liver Regeneration
Background:
- Hepatocyte regeneration is crucial for liver repair but can be defective.
- In defective regeneration, biliary ductules proliferate, forming structures like oval cells in animals.
- Oval cells are hypothesized to be a progenitor cell population in the liver.
Purpose of the Study:
- To propose that the liver harbors stem cells within the biliary epithelium.
- To suggest oval cells are progeny of these stem cells, acting as an amplification compartment.
- To explore the role of the biliary network in liver regeneration.
Main Methods:
- Review of existing literature on liver regeneration and oval cells.
- Analysis of the proposed stem cell hierarchy in the liver.
- Focus on the biliary epithelium as a potential source of hepatocytes.
Main Results:
- The liver contains stem cells located throughout the biliary epithelium.
- Oval cells are proposed as the progeny of these stem cells.
- These stem cells and their oval cell progeny facilitate hepatocyte generation when hepatocyte regeneration is overwhelmed.
Conclusions:
- The liver possesses stem cells in its biliary epithelium.
- Oval cells serve as an amplification compartment for generating new hepatocytes under specific conditions.
- The liver exhibits a conditional stem cell-driven regenerative process, distinct from continuously renewing tissues.